The negative ion mass spectra of (M - H)- ions from phenylthiohydantoin derivatives of amino acids

Eur. J. Mass Spectrom. 1, 381–387 (1995)
DOI: 10.1255/ejms.122

The negative ion mass spectra of (M – H)^– ions from phenylthiohydantoin derivatives of amino acids

Steven L. Ramsay, Russell J. Waugh, Thomas Blumenthal and John H. Bowie
Department of Chemistry, The University of Adelaide, South Australia, 5005, Australia.

ABSTRACT:

The mass spectra of (M – H)^– ions of phenylthiohydantoin (PTH) amino acids show characteristic fragmentations through the side chain (the a-side chain of the original amino acid) which may be used to identify each of the common amino acids. Some of these fragmentations are Leu (C₃H₈), Ile (CH₄, C₂H₆), Phe (PhH), Tyr (CH₂=C₆H₄=O), Trp (CH₂=C₈H₅N), Ser (CH₂O), Thr(MeCHO) and Met (MeSH). The formulae in parentheses represent the neutrals lost.

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